org.elasticsearch.common.lucene.LoggerInfoStream Maven / Gradle / Ivy
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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common.lucene;
import org.elasticsearch.common.io.Streams;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import com.google.common.base.Charsets;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
/**
* A {@link java.io.PrintStream} that logs each {@link #println(String)} into a logger
* under trace level.
*
* Provides also factory methods that basically append to the logger name provide the
* {@link #SUFFIX}.
*
*
*/
public class LoggerInfoStream extends PrintStream {
public static final String SUFFIX = ".lucene";
/**
* Creates a new {@link LoggerInfoStream} based on the provided logger
* by appending to its NAME the {@link #SUFFIX}.
*/
public static LoggerInfoStream getInfoStream(ESLogger logger) {
try {
return new LoggerInfoStream(Loggers.getLogger(logger, SUFFIX));
} catch (UnsupportedEncodingException e) {
// no UTF-8 ?
throw new RuntimeException(e);
}
}
/**
* Creates a new {@link LoggerInfoStream} based on the provided name
* by appending to it the {@link #SUFFIX}.
*/
public static LoggerInfoStream getInfoStream(String name) {
try {
return new LoggerInfoStream(Loggers.getLogger(name + SUFFIX));
} catch (UnsupportedEncodingException e) {
// no UTF-8 ?
throw new RuntimeException(e);
}
}
private final ESLogger logger;
/**
* Constucts a new instance based on the provided logger. Will output
* each {@link #println(String)} operation as a trace level.
* @throws UnsupportedEncodingException
*/
public LoggerInfoStream(ESLogger logger) throws UnsupportedEncodingException {
super((OutputStream) null, false, Charsets.UTF_8.name());
this.logger = logger;
}
/**
* Override only the method Lucene actually uses.
*/
@Override
public void println(String x) {
logger.trace(x);
}
}